<?php
/**
 * Created by PhpStorm.
 * User: gc
 * Date: 2018/1/10
 * Time: 20:14
 */

namespace Builder;
use Builder\Wrapper;

/**
 * 汉堡抽象类
 * Class BurgerAb
 * @package Builder
 */
abstract class BurgerAb implements ItemInter
{
    function packing(): PackingInter
    {
        return new Wrapper();
    }

    abstract function price() : float;
}